CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Tao Wu,Jingwei Wan,Xuebing Ma
Magnetic solid acid catalysts SO 4 2− /Zr(OH) 4 –Fe 3 O 4 were prepared using magnetic Fe 3 O 4 nanoparticles , ZrOCl 2 ·8H 2 O, and sulfuric acid as starting materials in the calcination temperature range 110–650 °C. The properties of the magnetic solid acid, such as loaded SO 4 2− content, acid distribution, surface morphology, and porous structure, were characterized. In the aqueous asymmetric aldol reaction of various benzaldehydes with strong electron-withdrawing groups (R = NO 2 and CN), good to excellent catalytic performance (83%–100% yield, 86.0%–95.6% ee anti , and anti/syn = 88–96/12–4) was achieved. These nanomagnetic solid acids can be quantitatively recycled from the reaction mixture using an external magnet and reused five times without significant loss of catalytic activity.
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 10
·106011
·
IF 2.07
Jie Yang,Bo Ruan,Wang Ni,Lung-Chang Tsai,Ning Ma,Dean Shi,Tao Jiang,Fang-Chang Tsai
Carbon dots (CDs) has been widely applied in LED diodes, sensing and bioimaging. However, the fluorescence property of CDs is limited because of the solid-state aggregation-caused quenching (ACQ). Metal-organic frameworks (MOFs), due to their high surface area, porosity and tunable pore size, are considered suitable hosts to inhibit the ACQ of CDs. Herein, the Zr-MOFs (UiO-66-(OH)2) is chosen as a host to encapsulate CDs. The dual-emitting CDs@MOFs system is constructed, which overcomes the problem of solid-state aggregation-caused quenching of carbon dots to gain the blue-emitting CDs@UiO-66-(OH)2. With the volume of CDs increased, the fluorescence of CDs@UiO-66-(OH)2 has changed simultaneously. When the volume reaches 3 ml, CDs@UiO-66-(OH)2 begin to cause fluorescence quenching. The correlated color temperatures (CCT) of CDs@UiO-66-(OH)2 are transformed from cold light to warm light. That can be further researched in electroluminescent diodes, ion-sensor, environmental monitoring, biological imaging and developments in other related biochemical fields.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chen Chen,Xu Guan,Hongbo Wang,Shijie Dong,Ping Luo
In this paper, a novel Al–Bi(OH) 3 system hydrogen-generating material is investigated. Hydrolysis experiments show that the hydrolysis properties of the Al–10 wt% Bi(OH) 3 composite are significantly improved by doping with sodium chloride, and the Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite has a low activation energy (10.4 kJ mol −1 ). With the further optimization of milling time, the hydrogen yield of Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite reaches 1000 mL g −1 in 1 min. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy and thermogravimetric analysis are applied to characterize the composite and explore the hydrolysis mechanism. The characterization results show that the activation of aluminum mainly comes from three factors: (1) The formation of alumina during ball milling plays an important role in preventing the agglomeration between Al–Bi, Al–Al and Bi–Bi; (2) Bismuth generated during ball milling can form micro-galvanic cell with aluminum to promote the corrosion of aluminum; (3) Sodium chloride as a grinding aid contributes to crush aluminum powder , and chloride ions facilitate the corrosion of aluminum in the hydrolysis process . In addition, the drying method and initial water temperature have a great influence on by-products. The composite is expected to be used in mobile emergency fuel cell due to its rapid hydrogen production capacity.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zonghua Pu,Qian Liu,Abdullah H. Qusti,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028 F g −1 at a current density of 10 A g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100 A g −1 , the array still shows a very high specific capacitance of 1059 F g −1 .
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Kaiwei Meng,Ziyi Fan,Huiming Wen,Yujie Hu,Wenjun Zhang,Zupeng Chen
The electrochemical conversion of glycerol-a biodiesel byproduct into formic acid coupled with hydrogen evolution reaction (HER) offers a green route for biomass utilization. However, existing systems suffer from high energy demands and insufficient selectivity. Herein, a self-grown copper oxide nanorods decorated with platinum species (Pt/CuO NRs) is developed, reaching a current density of 20 mA cm-2 at 1.14 V vs. RHE, with 97.4% formic acid selectivity at 1.40 V vs. RHE and nearly 100% glycerol conversion. Electrochemical impedance spectroscopy and in situ Raman spectroscopy reveal that Pt0 sites enhance electron transfer at the Cu3+-OH-Pt interface, facilitating CuⅢ-OOH formation. Density functional theory (DFT) analysis shows that Pt weakens O-H bond strength in CuOOH and lowers the dehydrogenation energy barrier, synergistically boosting GOR. Furthermore, a membrane electrode assembly (MEA) with Pt/CuO NRs as the anode and Pt/CuOx (c-Pt/CuOx) as the cathode is established for GOR and HER, respectively, which can operate at 1.55 V for a current density of 100 mA cm-2, reducing the potential by 380 mV compared to water splitting. The developed GOR(+)||HER(-) electrolyzer demonstrates stable performance for 100 hours at 150 mA cm-2, with a formic acid selectivity of 90%. This represents a significant improvement over existing copper-based catalysts, highlighting the green chemistry advantages. The techno-economic analysis demonstrated the economic viability of electrochemically converting glycerol into potassium dicarboxylate (KDF) and H₂, with processing costs of $4655-4797 per ton and a market value of $6389 per ton at representative commercial current densities of 100 and 300 mA cm-2.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13941-13947
·
IF 2.478
Liu Ying,Cao Bo,Zhang Xu,Luo Rong,Luo Chunhua,Lin Hechun,Peng Hui
Layered Co(OH) 2 has been regarded as a potential candidate for pseudocapacitor electrode material, but it is limited by its poor conductivity and low surface area. Herein, carbonated multi-walled carbon nanotubes (MWCNTs-COOH) were used to improve the conductivity of α-Co(OH) 2 nanocomposites. α-Co(OH) 2 nanoflowers were successfully grown and tangled with MWCNTs-COOH to form a randomly oriented network structure mediated by ammonia using water-methanol as co-solvent at room temperature. The capacitance performances of the obtained α-Co(OH) 2 @MWCNT-COOH composites were investigated to find that MWCNT-COOH improved the specific capacitance efficiently. Especially, in the presence of 20% in mole of MWCNT-COOH, the composite gave rise to the high specific capacitance of 1027 F/g at the current density of 2 A/g with good cycle stability, whose specific capacitance remained 78% of its original even after 5000 cycles at 30 A/g current. The large surface area and strengthening the conductivity of the composites lead to the improvement of efficiency in charge/discharge process.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yufen Gu,Bobo Guo,Zao Yi,Xianwen Wu,Jiao Zhang,Hua Yang
One decisive factor for the photocatalytic performance of ZnSn(OH) 6 (ZSO) is nanoparticle morphology. However, the mechanism of the well-defined morphology preparation remains unknown, which leads to the systematic investigation of various parameters in the hydrothermal method . Here, shell-like hollow Archimedean ZSO nanocubes were prepared by a hydrothermal method under suitable conditions, with a uniform particle size distribution and superior dispersion. The effects of hydrothermal time, temperature, pH and surfactant on the microscopic morphology and photocatalytic degradation of methylene blue (MB) dye were investigated. The enhanced photodegradation efficiencies ( η ) of MB were 97.7%, 96.3%, 89.6%, and 96.2% for 8 h-ZSO, 120 ℃-ZSO, 2.85-ZSO, and Hexadecyl trimethyl ammonium Bromide-ZSO (CTAB-ZSO), respectively, which strongly depended on the morphology, leading to differences in physicochemical properties, such as bandgap and charge transfer resistance. The results suggested that a single change in hydrothermal time, temperature, pH, or surfactant can effectively improve the microscopic morphology and photocatalytic performance of ZSO, which may pave the way for the ingenious design of other high-performance photocatalysts . A growth mechanism was proposed for shell-like hollow ZSO prepared in an alkaline environment.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ting Li,Xiaomeng Wang,Yanmei Chen,Jianru Liang,Lixiang Zhou
Heterogeneous Fenton has become a promising economical and environmentally-friendly method for water treatment, however, the production of abundant radical resources (e.g., O 2 − , OH) are oftentimes limited by finite Fe 2+ species to activate H 2 O 2 . Therefore, development of a new iron-bearing solid modified with diverse functional groups for generating a large of radicals in heterogeneous Fenton is significance. Here, we constructed a Fe 3 O 4 -modified schwertmannite (Fe 3 O 4 /Sch) catalyst to activate H 2 O 2 , SO 4 2− and O 2 to produce three kinds of radicals in heterogeneous Fenton reaction. Specifically, Fe 3 O 4 /Sch catalyst was synthesized to improve its surface properties such as the contents of surface Fe 2+ species as H 2 O 2 or O 2 activators to produce OH or O 2 − , the SO 4 2− of Sch surface as SO 4 − precursor, and electron transfer between Fe 3+ and Fe 2+ . Degradation rate of ciprofloxacin (CIP) for 6 min was up to 97% in Fe 3 O 4 /Sch-H 2 O 2 system, which was higher than that in Sch-H 2 O 2 or Fe 3 O 4 -H 2 O 2 . After four successive cyclic experiments, degradation rate of CIP was still achieved 97% within 10 min in Fe 3 O 4 /Sch-H 2 O 2 system. The formation pathways of the relevant active radicals and the degradation pathways of CIP were also proposed by theoretically calculated and LC-MS data. This finding has not only developed an efficient heterogeneous Fenton catalyst, but also given a new idea of SO 4 − generation by modified iron oxyhydroxysulfate mineral for application of heterogeneous Fenton technology.
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhenhua Ge,Bin Fu,Xing Li,Jinping Zhao,Bo Ma,Zhiqiang Luo,Yantao Chen
Electrochemical water splitting is a very prospective technique to obtain the green hydrogen fuel . The oxygen evolution reaction becomes a limitation owing to the multiple electron transfer process. Thereby, a lot of attention is paid on the development of noble-metal free electrocatalysts for boosting the water oxidation process . The heterostructure of Mn 3 O 4 nanoparticles on Cu(OH) 2 nanowire arrays is fabricated, which exhibits an electrocatalytic activity close to RuO 2 . Compared with the single (hydro)oxides, the largely improved performance of the heterostructure towards water oxidation can be attributed to the enhanced charge transfer by the electronic interaction across the interface and the increased active sites for the rational combination of different active species . This work can be valuable for highlighting the role of heterostructure in the design and development of novel transition metal-based electrocatalysts for water oxidation.
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Jiang Zi-Min,Xu Ting-Ting,Yan Cong-Cong,Ma Cai-Yun,Dai Shu-Ge
Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.
✓ 已验证
DOI
PubMed
高影响因子
Research
·
2023
·
IF 11
Guangchun Song,Jia Xu,Hong Zhong,Qi Zhang,Xin Wang,Yitong Lin,Scott P. Beckman,Yunbo Luo,Xiaoyun He,Jin-Cheng Li,Kunlun Huang,Nan Cheng
The enzyme-mimicking catalytic activity of single-atom nanozymes has been widely used in tumor treatment. However, research on alleviating metabolic diseases, such as hyperglycemia, has not been reported. Herein, we found that the single-atom Ce-N4-C-(OH)2 (SACe-N4-C-(OH)2) nanozyme promoted glucose absorption in lysosomes, resulting in increased reactive oxygen species production in HepG2 cells. Furthermore, the SACe-N4-C-(OH)2 nanozyme initiated a cascade reaction involving superoxide dismutase-, oxidase-, catalase-, and peroxidase-like activity to overcome the limitations associated with the substrate and produce •OH, thus improving glucose intolerance and insulin resistance by increasing the phosphorylation of protein kinase B and glycogen synthase kinase 3β, and the expression of glycogen synthase, promoting glycogen synthesis to improve glucose intolerance and insulin resistance in high-fat diet-induced hyperglycemic mice. Altogether, these results demonstrated that the novel nanozyme SACe-N4-C-(OH)2 alleviated the effects of hyperglycemia without evident toxicity, demonstrating its excellent clinical application potential.
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 34
·5512-5525
·
IF 5.342
Ming Zhang,Yifei Tu,Zibo Zhou,Guozhang Wu
The exo-hydroxyl group (exo-OH) on isosorbide (ISB) has long been asserted as a highly reactive moiety compared with the endo-hydroxyl group (endo-OH). In this study, calculations based on density functional theory and experiments without adding catalysts reveal that endo-OH has strong nucleophilic ability, and in the case of transesterification with diphenyl carbonate, the nucleophilic attack surmounts steric hindrance in rendering endo-OH more reactive than exo-OH. The kinetics of transesterification with different catalysts is investigated to determine the catalytic reactivity and molecular structure evolution. The results show that preferential activation of exo-OH moieties can be achieved either by reducing the coordination ability of catalytic cations (lg β1) or by enhancing the alkalinity of catalytic anions. Despite the low reactivity of exo-OH on ISB monomers, terminal exo-OH on carbonate oligomers exhibits higher reactivity than terminal endo-OH, justifying the experimental fact that ISB-based polycarbonates (ISB-PCs) are mostly terminated by endo-OH. Balancing the reactivity between endo-OH and exo-OH can be promoted by increasing the reaction temperature, thus accelerating transesterification to a high equilibrium constant. These findings help to clarify the mechanism of ISB transesterification and provide new strategies for the synthesis of high-molecular-weight ISB-PCs.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）